Traffic was backed up after a big rig toppled over on the westbound Interstate 10 near downtown about 2 a.m. Thursday.

Traffic was backed up after a big rig toppled over on the westbound Interstate 10 near downtown about 2 a.m. Thursday.

Photo: Houston Transtar

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Traffic was snarled on the East Freeway near downtown after a big-rig toppled over about 2 a.m. Thursday.

Traffic was snarled on the East Freeway near downtown after a big-rig toppled over about 2 a.m. Thursday.

Photo: Houston Transtar

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Portions of the Northwest Freeway near Mangum were blocked after a traffic crash about 8 a.m. Thursday.

Portions of the Northwest Freeway near Mangum were blocked after a traffic crash about 8 a.m. Thursday.

Photo: Houston Transtar

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Crash snarls Northwest Freeway

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Traffic was slowed Thursday morning after a crash on U.S. 290 in northwest Houston.

The two-vehicle wreck happened about 8 a.m. on inbound Northwest Freeway near Mangum, according to Houston TranStar.

Three lanes were temporarily closed while emergency crews cleared the scene. The lanes later reopened.

No information was immediately available about possible injuries.

Earlier Thursday, traffic was snarled on Interstate 10 in downtown after a big rig toppled onto its side, spilling a load of rolled paper.

The single-vehicle crash happened about 2 a.m. on the westbound Katy Freeway near Interstate 45, according to Houston TranStar.

The wreck forced officials to temporarily block three lanes. The lanes reopened about 7:30 a.m.

Initial reports indicate the trucker was traveling westbound on the Interstate 10 when he apparently lost control near the ramp to the southbound Interstate 45. The truck toppled over and large, heavy rolls of paper spilled from the big rig.